Fix bug 6495 (Emacs-style keybindings not working in location bar
	and other NautilusEntry fields) by adding an expert preference to
	control whether the Emacs shortcuts or the ones in the menu bar
	take precedence. I started with Maciej's patch and did many
	refinements.

	Fix bug 1788 ("Select All" needs to be implemented for text): I
	had to add Select All so it won't do the icon view's Select All
	when you do a select all with the location bar focused.

	Fix bug 5612 (clicking to deselect causes incorrect menu
	sensitivity) by adding another signal handler for button clicks.

	Fix bug 7581 (When trying to restart Nautilus after crash from bug
	7579 I get a Segmentation Fault). I was just lucky enough to run
	into the problem on my machine.

	* libnautilus-extensions/nautilus-global-preferences.h:
	* libnautilus-extensions/nautilus-global-preferences.c:
	(global_preferences_install_descriptions),
	(global_preferences_install_defaults),
	(global_preferences_install_visibility),
	(global_preferences_create_dialog): Added the new Emacs-shortcut
	preference with the wording requested in the bug report.

	* libnautilus-extensions/nautilus-entry.h:
	* libnautilus-extensions/nautilus-entry.c:
	(emacs_shortcuts_preference_changed_callback): Track the
	preference.
	(nautilus_entry_initialize): Set up the callback to track the
	preference.
	(nautilus_entry_destroy): Tear down the callback to track the
	preference.
	(nautilus_entry_key_press): Allow the emacs shortcuts built into
	GtkEntry to work if the preference is set that way. Also, only
	emit the selection_changed signal if the key is actually handled.
	(nautilus_entry_motion_notify): Simplify the logic, since it's
	OK to send the selection_changed signal a little too often.
	(select_all_at_idle): Handle the case where the object is
	destroyed.
	(nautilus_entry_select_all_at_idle): Ref the object to handle the
	case where the object is destroyed before the idle happens.
	(nautilus_entry_button_press): Send a selection_changed message,
	since pressing the button can cause a selection change.
	(nautilus_entry_button_release): Send a selection_changed message,
	since pressing the button can cause a selection change.
	(nautilus_entry_initialize_class): Add new default handlers. Also,
	move to bottom of file so we don't need so many forward
	declarations.

	* libnautilus/nautilus-clipboard-ui.xml: Add a Select All Text
	command.
	* libnautilus/nautilus-clipboard.c: (select_all): New function to
	select all the text in a GtkEditable. Sadly it needs a special
	case for GtkText.
	(select_all_idle_callback): Callback used to select the text from
	idle.
	(select_all_callback): Callback that sets up the idle. Called from
	the bonobo verb.
	(initialize_clipboard_component_with_callback_data): Add the
	callback for Select All.

	* librsvg/rsvg.c: (rsvg_state_init): Initialize more fields,
	including font_size.
	(rsvg_text_handler_characters): Don't try to draw if the font
	size is 0 or negative.
	* librsvg/art_render_mask.c: (art_render_mask_render): Handle
	cases where x1 < x0. The old code would seg. fault. This was the
	reason we got a crash in bug 7581.

	* configure.in: Upped the required version of gnome-vfs.